Thecaphora trailii

Thecaphora trailii Cooke, 1883

on Cirsium, Saussurea

gall

one or more cavities in the disfigured, never opening flower head are filled with a brown, granular-powdery mass of spore balls. Sometimes similar sori are formed as pustules on the peduncle below the flower head. The easily desintegrating spore balls consist of c. 2-5 spores.